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The reason to get blank screeen, fatal error or error 500 is only one: Component requirements. Trial version of extension require all Joomla requirements plus Ioncube loader (mbstring is required for both trial and paid version).

1. If problem is mbstring, you will get fatal error on page (or in error log): 3dwebdesign.org/forum/mbstring-call-to-u...ernal-encoding-t1355
2. If problem is missing Ioncube Loader, you will get blank screen or error 500. Ioncube loader is free and is installed on most hosting companies servers by default. And ioncube installation is free service on all sharing hosting services. If your host support don't want to install it, here is guide: 3dwebdesign.org/forum/how-to-install-ioncube-loader-t361

If you use paid version your server must support only mbstring.